What Is User Acceptance Testing?
App development is a complex process. As designers go through many iterations, sufficient testing must be done before an app is ready for release. After system tests that verify the app works approximately as expected, the final phase of testing is user acceptance testing (UAT). UAT is one of the last chances for developers and the QA team to catch issues and make substantial changes to the app before launch.
User Acceptance Testing Definition
User acceptance testing (UAT), sometimes called alpha/beta testing or end-user evaluation, is the final testing stage an app goes through before release. Developers also use UAT after launch to test new features or design changes.
Although UAT is sometimes called alpha or beta testing, that doesn't tell the whole story. Alpha and beta testing are only part of the full spectrum of tests that make up user acceptance testing. The goal of these tests is to determine if the app is suitable for release. While a few bugs will likely be discovered, by the time an app reaches this development stage, it is expected to be functioning correctly.
Purpose of Acceptance Testing in Development
UAT is used to verify how a product functions under real-world conditions. It is invaluable in app development because it helps development teams understand how users might technically respond to the final product and its features, catch any last-minute bugs, and test new features. As the name suggests, the main goal is to determine whether a theoretical user would consider the app or feature acceptable. Within this goal, different types of tests have their own purpose.
At the end of the UAT process, after all recommended changes have been made, the QA and development teams, along with the client, should be confident that the app is fully functional and ready for release.
In short, the goals of UAT are to confirm that the app:
- Meets client requirements
- Meets users' technical needs
- Complies with regulations
Why Is Acceptance Testing Necessary?
There are a vast number of apps. Users often have a huge range of options for any task, so for your app to stand out and retain users, it's not enough for it to be functional; you need to make it as user-friendly and enjoyable to use as possible.
Improve UX
UAT helps ensure your app is not only functional but also user-friendly. Yes, acceptance may seem like a low bar, but if done right, UAT lets you enhance the user experience to the point where users will not just accept the app but embrace it. This is a critical stage for good UX.
Catch Last-Minute Bugs
Often when we design and build products, we are so close to the product that it's hard to see it clearly. When QA specialists and developers test it and provide feedback, we get a fresh look at the product and often catch issues we would never have noticed or thought of.
Save Money
Sending apps out into the world without UAT can be extremely costly because there are always issues that went unnoticed earlier. Fixing them post-launch is far more expensive than doing so beforehand. Plus, there's the added issue of potential user drop-off—if they have a bad experience once, they are unlikely to give the app a second chance.
Types of Acceptance Testing
There are several types of tests that make up UAT, conducted at various times during the development process:
Alpha Testing
Alpha testing is carried out by internal staff, often employees of the client organization, as the app nears completion. The idea is for alpha testers to experience the app as an end user would and provide feedback so developers can identify bugs and make changes.
Alpha testing usually takes place in the development environment and is the first chance to catch issues outside the test environment. The development team does not participate in alpha testing but observes testers and records the results before making necessary changes.
Beta Testing
Beta testing, or field testing, is conducted after alpha testing but before the app is released. Testing takes place in a real working environment, with specially selected users who are not part of the client organization.
Beta testing allows developers and the QA team to find any remaining bugs, understand how users interact with the app, and gather feedback on the user experience. Beta testing is also used to validate new features or significant changes in already released apps.
Black-Box Testing
Black-box testing, also known as behavioral testing, is performed by a tester familiar with the app's functional specifications but not with the code. They check whether the app works as intended, and typically many iterations are run throughout the development process at each stage of the testing cycle.
Black-box testing helps identify major issues in the app's operation while the tester has no access to the code. It is sometimes categorized as a type of functional testing.
Contract Acceptance Testing
At the start of the development process, a contract is drawn up between the client and the developer outlining expectations and requirements for the finished product. Contract acceptance testing determines whether the contract terms have been met.
Operational Acceptance Testing
Operational acceptance testing, or production acceptance testing, checks how smoothly and reliably the app works with all components of the operational environment. This includes maintenance, security, and update systems, user training and workflows, as well as backup plans for failures.
Regulatory Acceptance Testing
Regulatory acceptance testing, or compliance testing, is conducted to determine the app's adherence to relevant industry, governmental, and legal regulations and laws.
Who Is Involved in Acceptance Testing
Acceptance tests are typically designed and executed by development and QA teams with client involvement.
Roles in the UAT process can vary based on factors like the types of tests being run and the size of the operation, but generally the roles and responsibilities look something like this:
- Client: Connects with development and QA teams to define requirements and expectations. May provide employees for alpha testing. Signs off when requirements are met.
- Development Team: Designs and implements tests, may observe testers and review data. Makes necessary code changes.
- QA Team: Trains and observes testers, collects and analyzes data, reports results and further requirements to the development team. Presents findings to the client.
- End Users: Selected users perform beta testing and report their findings to the development team.
When Acceptance Testing Is Conducted
UAT is conducted at the end of the development process, when the app is almost ready for release. Before UAT, several other types of testing occur in the app development lifecycle, including system testing and usability testing. UAT also happens after launch when new or changed features are introduced.
Different types of UAT are performed at various stages of development and the app lifecycle:
- Before Initial Release: Black-box testing, alpha testing, operational, regulatory, and contract acceptance testing.
- Pre-Release Patch or Update Testing: Beta testing, black-box testing
- After Release: Beta testing of new features, black-box testing